174 NEW UNIONIDiE, MELANID^, ETC., 



short, obtuse and scarcely exserted ; whorls three, the last one large and inflated ; 

 outer lip acute, the inner margin being thickened ; aperture very large and dilated ; 

 columella thickened, impressed and twisted. 

 Proc. Acad. Nat. Sci., 1864, p. 116. 



Eab.—OttsLVfa. River, Canada West, E. Billings, Esq. 



My cabinet and cabinet of Mr. Billings. 

 Diam. -25, Length -38 ? inch. 



Remarlcs. — Three specimens are before me, which were sent by Mr. Billings with 

 other shells some years since. I was in hopes of getting more, and delayed the de- 

 scription. It is allied to the American species globosa, Hald., and the European 

 species fontinalis, Pfeif, but is more obtuse at the apex than either of them. The 

 aperture is about six-sevenths the length of the shell. 



Physa Febigerii. pi. 24, fig. 99. 



Testa elliptica, pellucida, polita, pallida ; spira obtusa, curta ; suturis vix impressis ; anfractibus quinia, 

 ultimo grandi et subconstricto ; apertura ovata, superne angulata; labro aouto, intus incrassato ; 

 columella vix impressa. 



Shell elliptical, somewhat transparent, polished, pale colored; spire short and 

 obtuse; sutures scarcely impressed; whorls five, the last one large and somewhat 

 constricted; aperture ovate, angular above; outer lip acute, thickened within; 

 columella scarcely impressed. 



Proc. Acad. Nat. Sci., 1864, p. 114. 



Eab. — Logan County, Ohio, Major G. L. Febiger, U. S. A. 



My cabinet. 

 Diam. -23, Length -40 inch. 



Eemarhs. — I have had two specimens many years in my cabinet, without being 

 able to place them with any species I know. It is allied to aurea and elliptica, 

 (nobis,) but more closely to foiitinalis. Pfeif, a European species. It differs from 

 aurea in being less inflated, being of a lighter color, and having a shorter spire and a 

 thinner and lighter colored inner margin; from ellij^tica in having a more obtuse 

 spire, being more inflated, of a lighter color, and having a lighter inner margin. It 

 is a larger and rather thicker shell than fontinalis, while being very nearly of the 

 same outline it is rather more inflated, and has a thicker inner margin, fontinalis 

 being almost devoid of any thickening. 



In most species of Physa there is a whitish line immediately below the suture, and 

 it is very observable in this. The tip of the spire is dark brown. The aperture is 

 about two-thirds the length of the shell. I name this species after my nephew, 

 Major Febiger, to whom I owe the possession of it. 



